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MSP430G2433 外部晶振不起振!!!!!!!!!

我外接了一个外部8MHz的晶振,但是测了一下主频只有0.1MHz。把RSELx=7;主频能达到1MHz,

BCSCTL1 &= ~XT2OFF;      // 打开XT2晶振
  BCSCTL1 |= XTS;
  BCSCTL2 |= SELM1+SELM0+SELS;   // 选择MCLK的时钟源为XT@晶振
  BCSCTL3 |=XT2S1+LFXT1S1;

晶振连的是P2.6 P2.7;望指教~~~~